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  1. ∠Y is the right angle of the trianlge XYZ. If XY = 2 √6 cm and XZ – YZ = 2cm, then the value of (secX + tanX) is :
    1. 1
      6

    2. 1
      2√3

    3. 2√6
    4. 6
Correct Option: D


XY = 2 6 cm
XY – YZ = 2 cm. ...(i)
∴ XZ2 = XY2 + YZ2
⇒ XZ2 - YZ2 = (2√6)2
⇒ XZ2 - YZ2 = 24

XZ2 - YZ2
=
24
XZ - YZ2

⇒ XZ + YZ = 12 ....(ii)
⇒ secX + tan X =
XZ
+
YZ
XYXY

⇒ secX + tan X =
XZ + YZ
=
XY

⇒ secX + tan X =
XZ + YZ
=
12
= √6
XY2√6



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